有人可以帮忙看看我的I2C代码吗？

我一直在我的PIC16F15355上运行I2C作为一个奴隶，一段时间没有问题。我切开并粘贴了一个我找到的司机，把它清理干净了。我现在写了一个I2C引导加载程序，我不能得到I2C的所有响应。与我其他代码的主要区别在于，在引导加载程序中没有中断。我只是轮询并寻找中断的SSP1IF标志。我可以用我的PICtiT3加载引导加载程序，并在轮询循环上中断。但是没有设置SSP1IF标志。我的范围显示了起始位和地址字节，但是没有PIC的ACK。信号看起来完全一样，如果没有PIC根本。这是我的主要…和我的I2C代码看起来像这样…任何帮助都将被赞赏…



      以下为原文

    I have been running I2C as a slave on my PIC16F15355 for some time with no problem. I cut and pasted a driver I found and cleaned it up a bunch. I have now written an I2C bootloader and I can't get the I2C to respond at all. The major difference from my other code is that there are no interrupts in the bootloader. I'm just polling and looking for the SSP1IF flag with interrupts off.
I can load the bootloader with my pickit3 and break on the polling loop. But the SSP1IF flag is not being set. My scope shows the start bit and address byte but there is no ack from the PIC. The signals look exactly the same as if there was no PIC at all.
Here is my main ...

// I2C bootloader for PIC16LF15355
// code used with the bootloader should offset the code by 0x200
// search xc8 user manual for --CODEOFFSET and --ROM
#pragma config FEXTOSC = OFF // External Oscillator mode selection bits (Oscillator not enabled)
#pragma config RSTOSC = HFINT32 // Power-up default value for COSC bits (HFINTOSC with OSCFRQ= 32 MHz and CDIV = 1:1)
#pragma config CLKOUTEN = OFF // Clock Out Enable bit (CLKOUT function is disabled; i/o or oscillator function on OSC2)
#pragma config CSWEN = ON // Clock Switch Enable bit (Writing to NOSC and NDIV is allowed)
#pragma config FCMEN = ON // Fail-Safe Clock Monitor Enable bit (FSCM timer enabled)
#pragma config MCLRE = ON // Master Clear Enable bit (MCLR pin is Master Clear function)
#pragma config PWRTE = OFF // Power-up Timer Enable bit (PWRT disabled)
#pragma config LPBOREN = OFF // Low-Power BOR enable bit (ULPBOR disabled)
#pragma config BOREN = ON // Brown-out reset enable bits (Brown-out Reset Enabled, SBOREN bit is ignored)
#pragma config BORV = LO // Brown-out Reset Voltage Selection (Brown-out Reset Voltage (VBOR) set to 1.9V on LF, and 2.45V on F Devices)
#pragma config ZCD = OFF // Zero-cross detect disable (Zero-cross detect circuit is disabled at POR.)
#pragma config PPS1WAY = ON // Peripheral Pin Select one-way control (The PPSLOCK bit can be cleared and set only once in software)
#pragma config STVREN = ON // Stack Overflow/Underflow Reset Enable bit (Stack Overflow or Underflow will cause a reset)
#pragma config WDTCPS = WDTCPS_31 // WDT Period Select bits (Divider ratio 1:0x10000; software control of WDTPS)
#pragma config WDTE = OFF // WDT operating mode (WDT enabled regardless of sleep; SWDTEN ignored)
#pragma config WDTCWS = WDTCWS_7 // WDT Window Select bits (window always open (100%); software control; keyed access not required)
#pragma config WDTCCS = SC // WDT input clock selector (Software Control)
#pragma config BBSIZE = BB512 // (512 char boot block size)
#pragma config BBEN = ON // (Boot Block enabled)
#pragma config SAFEN = OFF // (SAF disabled)
#pragma config WRTAPP = OFF // (Application Block not write protected)
#pragma config WRTB = OFF // (Boot Block not write protected)
#pragma config WRTC = OFF // (Configuration Register not write protected)
#pragma config WRTSAF = OFF // (SAF not write protected)
#pragma config LVP = OFF // Low Voltage Programming Enable bit (High Voltage on MCLR/Vpp must be used for programming)
#pragma config CP = OFF // UserNVM Program memory code protection bit (UserNVM code protection disabled)
#include
#include "main.h"
#include "i2c.h"
#include "flash.h"

#define _str(x) #x
#define str(x) _str(x)
void interrupt service_isr() {
asm ("pagesel " str (NEW_INTERRUPT_VECTOR));
asm ("goto " str (NEW_INTERRUPT_VECTOR));
}
void main(void) {
if(haveApp()) { // jump to app
STKPTR = 0x1F;
asm ("pagesel " str(NEW_RESET_VECTOR));
asm ("goto " str(NEW_RESET_VECTOR));
}
// run bootloader
i2cInit();
while(1) chkI2c();
}

And my I2C code looks like this ...

#include
#include "i2c.h"
#include "flash.h"
void i2cInit() {
SSP1CLKPPS = 0x13; // RC3 => SCL in
SSP1DATPPS = 0x14; // RC4 => SDA in
RC3PPS = 0x15; // SCL => RC3 out
RC4PPS = 0x16; // SDA => RC4 out
SSP1MSK = 0xe7; // matches addr 4 and/or 8
SSP1ADD = 0; // all but 4 and 8 must be zero

SSP1CON1bits.SSPM = 6; // I2C Slave, 7-bit address
SSP1CON1bits.WCOL = 1; // Write Collision detect
SSP1CON1bits.CKP = 1; // Zero holds clock low (clock stretch)
SSP1CON1bits.SSPEN = 1; // Serial Port Enable bit
SSP1CON1bits.WCOL = 0; // clr flag to allow bytes to be received
// SSP1CON1 = 0b10110110;

SSP1CON2bits.SEN = 1; // Stretch Enable
SSP1CON2bits.GCEN = 0; // General Call Enable
// SSP1CON2 = 0b00000001;

SSP1CON3bits.SCIE = 0; // Start Condition Interrupt Enable
SSP1CON3bits.PCIE = 0; // Stop Condition Interrupt Enable
SSP1CON3bits.BOEN = 1; // Buffer Overwrite Detect Enable
SSP1CON3bits.SBCDE = 1; // Bus Collision Detect Enable
SSP1CON3bits.AHEN = 0; // Address Hold Enable for software ack/nak
SSP1CON3bits.DHEN = 0; // Data Hold Enable for software ack/nak
// SSP1CON3 = 0b00010100;

SSP1IF = 0; // clear I2C int flag, is used without interrupts
}
// ---- SNIP ----
void chkI2c() {
if(!SSP1IF) return; // int flag used without interrupts
SSP1IF = 0; // <<<< A BREAK HERE NEVER HAPPENS
// ---- SNIP ----
}

Any help would be appreciated...

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